Competitive Exams: Zoology MCQs (Practice-Test 107 of 112)

  1. Diastema is the empty space between

    1. incisor and premolar

    2. incisor and canine

    3. canine and molar

    4. premolar and molar

  2. Mimicry is

    1. structural adaptation

    2. animal association adaptation

    3. protective adaptation

    4. regulated by environment factors

  3. When a hybrid tall pea plant (Tt) of F1 generation is crossed with its dominant parent (TT) in a back cross, then the resulting tall progeny of F2 generation is homozygous and heterozygous in the ratio of

    1. 3: 1

    2. 1: 1

    3. 2: 1

    4. 5: 1

  4. Peripatus is a connecting link between

    1. annelids and arthropods

    2. arthropods and molluscs

    3. molluscs and echinoderms

    4. annelids and molluscs

  5. The first vertebrates to appear on the earth were

    1. Cyelostoms

    2. Placoderms

    3. Ostracoderms

    4. Chondrichthyes

  6. At present, the Dipnoans are distributed over

    1. Europe and North America

    2. Latin America and Australia

    3. Europe and Latin America

    4. North America and Australia

  7. Both and Zebra and the African lion live in the tropical grasslands but occupy different

    1. biospheres

    2. environments

    3. ecological niches

    4. habitats

  8. Which one of the following is not characteristic of largesized animals in nature?

    1. Higher metabolic rates per unit body weight

    2. Longer generation time

    3. Lower reproductive rates

    4. Slower growth rates

  9. During migration, birds determine compass directions using

    1. land markings and water bodies

    2. water bodies and mountains

    3. celestial bodies

    4. mountains and land markings

  10. The discharge of raw sewage into waterways causes the collapse of aquatic ecosystems, primarily because of

    1. lack of dissolved oxygen

    2. lack of nutrients

    3. increased levels of carbon dioxide

    4. growth of algae

  11. The mesonephric duct or Wolffian duct develops as

    1. Ventro-lateral evagination from the mesonephric vesicle

    2. Dorsal evagination from the mesonephric vesicle

    3. Ventral evagination from the mesonephric vesicle

    4. Dorso-lateral evagination from the mesonephric vesicle

  12. Anterior neuropore persists throughout the life in

    1. Chick

    2. Amphioxus

    3. Frog and Amphioxus

    4. Chick, Amphioxus and frog

  13. The gray crescent of frog's embryo represents the future

    1. Anterior side of the developing embryo

    2. Posterior side of the developing embryo

    3. Dorsal side of the developing embryo

    4. Ventral side of the developing embryo

  14. Which of the following pairs are correctly matched?

      • Mesencephalon
      • Mid
      • Brain
      • Diencephalon
      • Cerebellum
      • Telencephalon
      • Cerebral hemisphere
      • Myelencephalon
      • Medulla oblongata

    Select the correct answer using the codes given below:

    Codes:

    1. 2, 3 and 4

    2. 1, 3 and 4

    3. 1, 2 and 4

    4. 1, 2 and 3

  15. In ascidian tadpole larva (tunicate), the notochord is present

    1. Throughout the body length

    2. In the anterior part of the body

    3. Restricted only to the tail and trunk region

    4. In parts